And..... we're BACK!
I was poking around at the gaming den board yesterday while BG was down (and I was bored), and came up with an idea for how to deal with consumables (potions, etc).
1) You can't cast spells from scrolls. They are only used to transfer spell knowledge.
2) Charged items like wands and staves DO count against your attuned 8 items (we're already doing this).
3) Potions we'll leave as-is (they don't count as attuned items, and only work once).
4) Other items we'll deal with on a case by case basis.
5) If a spell appears on the spell list of a core caster, then all magic items crafted which duplicate the effects of that spell must use it at the level it appears on the core list. So no trapsmith wands for ju!
6) As with crafting, you can't Wish for partially charged items.
I think this will work ok, since potions are limited to 3rd level spells and below. This gets rid of everyone just stocking up on 9th level scrolls and unloading each combat once you can afford it.
For the Candle of Invocation, I'm going to say that each individual can only use the Gate function of such an item once in their lifetime. It is kind of like a "get out of jail free" card from the gods (or whatever forces favor that character). So you could conceivably use one of these to bootstrap your way into the Wish economy, but that would be it for you until you or your party mates are capable of binding/traveling to some creature capable of granting wishes yourselves. So you better make sure you get everything you want with that candle!
Also, I noticed that the Tome Warmage that Kuro is using doesn't have any class skills listed (Koumei wrote it, and s/he thinks all classes should have all skills as class skills...). So I guess we'll just use the class skill list from the original warmage, but everything else from hers.